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Electronics Engineering
Electronics Engineering is a branch of engineering that deals with practical applications of electronic components, devices, systems, or equipment. Electronics are devices that operate on low voltage sources, as in electron tubes, transistors, integrated circuits, and printed circuit boards and use electricity as part of its driving force.
24,372 Questions
What are special purpose diodes?
Special diode does special function.
Diodes are originally used to rectify ac current into dc current . Other versions of diodes are constructed in a similar way using the same principles but their function is not rectification such as light emmision diode
In an electric circuit what provides the push?
You could consider the Voltage as the pushing force in a circuit. It drives the current.
Why you choose rms value of voltage and current for calculations?
Because peak to peak measurements are only accurate if the wave is nearly perfectly sinusoidal and without excessive sideband spurs. An average measurment wheather it be done by a gizzmo that did the math for us or an o-scope where we have to divide what we see by 2.828 for the RMS value. A digital voltmeter simply averages all of the voltage changes into "a number" that agrees with what the predicted mathematical value should be. these devices always have frequency limitations. You should slways check the specs of your measuring device before you start to make sure it is capable of making an accurate enough measurement at the freqyency you have in mind.
AnswerAll a.c. voltages and currents are expressed and measured in rms values, unless otherwise stated. So it follows that any calculations would be done using these values.
A: HARD TO SAY because a bulb has different resistance as it warms up
A:
The inductor does not allow ac signal to pass through. It blocks ac and passes dc. If the switch is open, then the ac signal wont pass. If the switch is closed, then the ac signal will pass through the switch.
Answer
It is incorrect to say that an inductor 'does not allow' the passage of an alternating current. An a.c. current will pass through an inductor, although the inductor will limit the value of that current due to the inductor's inductive reactance. Inductive reactance, which is expressed in ohms, is directly-proportional to the inductance of the inductor and to the frequency of the supply. The value of the current is determined by dividing the supply voltage by the inductive reactance of the inductor.
If the switch is connected in parallel with the inductor, then closing the switch will apply a direct short circuit across the inductor, and the resulting short-circuit current will cause the circuit's protective device (fuse or circuit breaker) to operate.
What happens when you apply DC directly to a capacitor?
When you apply DC directly to a capacitor, it charges to the value of the DC potential, and then there is (nearly1) zero current flow through the capacitor. If the capacitance is large enough, though, and the DC source has a low enough impedance, the current flow can be quite substantial, damaging things.
The reason the equilibrium current is zero is that a capacitor resists a change in voltage, proportional to current and inversely proportional to capacitance...
dv/dt = i/c
... which makes the capacitor essentially a high pass filter, and a DC blocker.
1 The equilibrium current is "nearly" zero because, in our non-ideal world, every capacitor has some leakage current. Practically, the current is zero - from a purist perspective, it is not.
Why is the meter to measure current called an annmeter?
It's called an ammeter, because it measures amperes.
What properties of liquid crystals are useful in making electronic displays?
they can rotate polarization of light causing filters to block or pass it under electrical control. they consume almost no power doing this.
An oscillation is a term we could use to refer to a single cycle of a cyclic or repeating motion. Let's just take one example (so we don't run it into the ground) and see how it applies. And we'll use that familiar pendulum clock. The pendulum on a clock will be driven by a spring. We swing the pendulum up, release it, and gravity and the spring do the rest. The spring, as you have guessed, adds just enough energy to offset the friction loss in the system. When we lift the pendulum and release it, it is pulled down (accelerated) by gravity. It passes through a point where it is at the "bottom" of the swing (having achieved maximum velocity), and then heads up on the other side. It's decelerating here under the influence of gravity - that same gravity that accelerated it. I continues to slow, it stops, and then accelerates back down and across the "middle" or "bottom" again. Up it goes to the top of its arc on the other side, and it returns to its starting point. It has completed one cycle of its oscillation. It has performed one oscillation. Simple, and easy.
since the volt amphere turns in secondary neautralises the primary voltamphere turns making the magnetic flux in the core remain constant
How do you calculate the current gain of a transistor JFET?
FETs don't have current gain as no current flows through the gate.
The gain of a FET is a voltage gain and is called mu.
Do higher watt inverters drain batteries more than lower watt?
The inverter draws little current on its own. It is the load that is connected to the inverter. If there were no load on the inverter you could use an ampmeter to determine the no load current. One thing to consider is that a higher wattage inverter would have larger gauge wire which is of lower resistance. This could make the no load current lower for the higher wattage inverter. Bottom line is you would have to measure or have a specification on the no load current.
What is the the term for a semiconductor that is missing electrons?
p-type semiconductor A semiconductor that is missing electrons is called an electron hole.
When measuring an unknown value of voltage the meter should be initially set to?
With an unknown voltage you should start out with the highest voltage setting on the meter. Doing this reduces the risk of "pegging" out the needle on an analog gauge or overloading the input of a DMM. Most DMM's are auto-ranging though.
Can all receptacles in a bedroom be on the same circuit?
yes
Answer for UK SystemThe answer is yes, as all the outlets will be supplied from the same ring main.
What type of flags in 8086 and 8088 microprocessor and their uses.?
There are nine flags in the 8086/8088.
- SF - Sign Flag - The result is negative
- ZF - Zero Flag - The result is zero
- AF - Auxillary Carry Flag - A BCD carry occurred
- PF - Parity Flag - Indicates the oddness or evenness of the number of bits
- CF - Carry Flag - An unsigned carry occurred
- OF - Overflow Flag - A signed overflow/carry occurred
- DF - Direction Flag - Controls the direction of repeated string operations
- IF - Interrupt Flag - Enables or disables interrupts
- TF - Trace Flag - Controls the debug single step interrupt
In general, most of these flags are set as a result of some arithmetic or logical instruction and can be tested using the conditional branch instructions. Exceptions are DF, which controls the directionality of repeated string operations, IF, which controls interrupts, and TF, which controls debugging.
What is the application of bipolar junction transister?
moreover it can act as a resistor.they can amplify weak signals into strong signals.
in a chip which is used to run a computer or laptop there are millions of transistors cascaded in a chip which has size nearly of fingernail. you can find more information on youtube
By-Nihar.N.Suryawanshi.
What is coupling in electronics?
AC coupling is where a capacitor is used to block the DC componant of a signal. Used often in Medical devices when a DC componant could harm a patient Coupling refers to transferring electrons trough a media. It could magnetic such as coils proximity. A transformer and yes even a capacitor. And no it has no medical devices ONLY application.
Which is used for longer distances amplitude modulation or frequency modulation?
Long-distance radio communication Amplitude Modulation (AM) is the answer, because Frequency Modulation (FM) works at frequencies greater than from 50 MHz and can only be used for line-of-site communication, although it can be used to communicate for long distances into space.
For long-distance communication, AM and Single-sideband (SSB) modulation can be used in the high-frequency (HF) range in the region of 30 MHz, but the distance is limited to about 30 to 100 kilometers. If ionospheric conditions are good, however, communicating with someone at the opposite side of the globe is possible, because radio signals bounce off the ionosphere back to the Earth and then back to the ionosphere. This phenomenon is called "skip."
If you desire continuous long-distance communication, you need to use the lower band of the RF spectrum: long-wave, medium-wave or short-wave signals. With AM, these frequency ranges are not affected by obstacles like mountains or buildings and are called ground waves, because they follow the contour of the Earth. Hence, with enough power and a good directional antenna, it is possible to communicate around the Earth. The only problem is Static-interference (QRM) on the received signal that can make clear communication next to impossible. Sunspots and other sun activities can also affect this type of communication and can even blank out communication totally, a phenomenon known as "radio silence."
The ampere is one of the seven SI base units, and is used to measure current.
It is defined in terms of the force between two parallel conductors due to the magnetic fields set up around those conductors.
This happened to me to but this may help
move the world of warcraft folder (the whole folder) onto the desktop MOVE NOT COPY
and then change the realmlist. you can keep it on the desktop
NOTE: the wow shortcuts will not work after you move the folder but u can make a new one ;)
